How to configure xorg.conf for widescreen VNC on headless Linux/Ubuntu?

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http://unix.stackexchange.com – I have a Ubuntu 12.10 Box configured to run headless. I've managed to boot X headless by a lot of trial and error but I still have a glitch: When booting using the monitor, it all works ok, widescreen resolution and all, when booting headless it will stick with 4:3 resolutions, I suspect that it has something to do with the vesa driver. Specs: video card intel HD 4000 (i7 integrated) ubuntu 12.10 (latest updates) here is my /etc/X11/xorg.conf: Section "Device" ### Available Driver options are:- ### Values: <i>: integer, <f>: float, <bool>: "True"/"False (HowTos)